Headache Disorders, Secondary

• University Hospital — Örebro, Sweden
• Karolinska Hospital — Stockholm, Sweden

• University Hospital — Örebro, Sweden
• Karolinskasjukhuset — Solna, Sweden

• Dışkapı Yıldırım Beyazıt Education and Research Hospital — Ankara, Turkey (Türkiye)

• Mayo Clinic in Rochester — Rochester, Minnesota, United States

• Emergency Department — Monastir, Monastir Governorate, Tunisia

• Alabama Physical Therapy & Acupuncture — Montgomery, Alabama, United States

• Des Moines University — Des Moines, Iowa, United States

• University of Alcala — Alcalá de Henares, Madrid, Spain

Not specified

Not specified